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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9ee853813e83ede50f8b238c2dfc0bc0eb58bc9335cf8728a768b796f1d428e' 
  AND token = 'qpxcaomVZTqwJbWp99MxQSYEx5kMwP8/oh8B/iEjons=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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