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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97417c3d8d5fa4d45ec2cfa5b6209b681764d61125eaeee896bc393b323ef90e' 
  AND token = 'ufnNAoHlcZjV79zwU3HJ+Td7P6cLu6lKwOsMo7nci8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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