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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8109caf002b8f75301204d3cb50c8039d768765060ac623905ec297e8c30b5d' 
  AND token = '4NsDy9wePd2+5fMix3QcVINC3aUrOg/aNEbcHmz4JQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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