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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86a312072dbd894042bfddc903d3ec29e5d3769e56f64078fb95853884288863' 
  AND token = 'n/8pV25gbWkmdgzoF3TlqEeFk+eU/psYVj9zfp+pO1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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