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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee90ee0b5087832b2c84dc2df0ac90019f6025ba67ec40f825a8e7b0cf652ed7' 
  AND token = 'QofXoORwLv8ggk1mGSsXEpJOUYC+Hsra9evYvZKSaK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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