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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a7f1023ec4ed347be2e89eebd23133c7ed2056f251f5bc9802a0fff7e219312' 
  AND token = 'fgQk1fOqMtXGCoqgp5K97HPMXjzdnL8A8bZOo/kBRo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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