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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '874c5de1773c80ea3bf411451f0032d5e86999e10f5779c234dbaa7e134b9e05' 
  AND token = '0SGej9soZh54AL2CepCESdEHUw1qrfIF/ctWWnlqGoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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