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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91d3934e5a07fdbdabebd5ea6c0a91940d72741743f60987fc898c2d9da61f95' 
  AND token = 'sSRK9ZsDkESJTSuwqrRZWtOPn/EEGUHSNWH7cut5Fus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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