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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fe821faf806a5285e3faf69d682d55efae54f5cdc20a66cae47e5f2d7612e11' 
  AND token = '+OnyOtOcwDzuGXWJ+Z1gYfBy/pY14hYeNS4NYS8UK0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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