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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2aa47a66e1963768b2ad335284d782f1d3be1404dab4277db6a8f832149da4f7' 
  AND token = 'ArzPla7U75AMu8aUe47IqBDZtak/ID03koOPACEe9v8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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