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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71a86aadfb61eaa52982d2c960d427c5c0459a3c584c97bafb1b8b888aef13d0' 
  AND token = 'XjnZ0LnHJ0Zex6r95nBGqxZ6G/lYNBcdv9vEELWfEdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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