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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62b4f7b2dc1e3868bfb40cd6f867d300739d2adafa9c93e875405f2dcaffc4eb' 
  AND token = 'Re8rf4oOr+YOvzZD2uEYpihIzV9Ge+yKNwW42apnBII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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