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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e25e09eaa77ee1fa3a31f25276fd7e306c311cdc64cdd7c1e4da0facf2426fa5' 
  AND token = '19jTtNukBrlEelUzn7Uitoi2nV4cfqlQq+2OgKYAnts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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