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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '736073682637e827879d0fbb085f05020df8949d2b402237ddc84fc17b96c7eb' 
  AND token = 'FawDTd1yExQHn92MQMYLuDCdS8HS3ceWDeXtoioKaBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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