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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a19bcc339cab26db094d106611b2382e99ac1a29d615f21dae86ef1c66f0dd17' 
  AND token = 'l/GjhT5NOJWpRM3taWQB25cniFUvVTTt3w9rZ7cFyYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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