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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7852e430df3d1e5ef21c6d363ba29d67f147c15f74afe466b53efaa8f2c7b1b' 
  AND token = 'CLu5GpasEPl70LPRFcSYcFAS6cQVb5FD1Joqta3vC9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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