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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e03969090123fac2930ac4be90f8187e7661ad3bf6575e4ac7c9c9f5516a489' 
  AND token = '+xNjT5Cwk3KNYOPcelwEftPNaHbZvNapLnT8ppOS9Wg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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