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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5874ef2b75e0ed1d2ce8ae9d4b76969504a5b6d91b81d24db8152f3e15eac64f' 
  AND token = 'Tv4oBt0JIa2lqWDfIAFWPsPWTDYTswKkQR8K8Y2wIQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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