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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8fb50207a3c385b028bb1661529af97bcdf77f49aa90fdd21135db9b52c2d6e' 
  AND token = 'IxGcWlyPL1p5qRo0d9TajfYOa6AyJd2eJcNpFzFUz7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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