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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '326d962ba319aa4cd8d4fdb9a3036c2d33b13e5b1e42f172c3e4d60a9aa5cace' 
  AND token = 'jZOMoFLMK7iG0RDl4AllYc90nh+Waa40CLgTDDsKjP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}