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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebd3d499446446d1fd7b6e3bf9be10742c3386421eb0d2f61f50ae9f7bf7fd97' 
  AND token = 'V4W5jusrnriZq15sxOfgw1crxvvyv6FOkaaEDrk4r5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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