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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aae78cd21a4fec81bce54fc9c504c7e2d0649d956b5bae1ba2f57cd4222c41a7' 
  AND token = 'G43cD2r7Yp2+jmOodC8EuzhpzlH7MbeWFeEji3J+smc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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