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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13d09ea393c0271dc97aef2f506f32391a741b11f6c415109555a3d101fcc3c0' 
  AND token = 'hpDNPVf8eFG7uH2vN7I2HtQO6Kfiv0H+hEuW78BnuGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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