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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98ea9be54b8ba04addb9b2e9656f58e592e110c95d9021b322ee3d81ef43be6d' 
  AND token = 'lLKE7cAuKxzGIEaqqPIX07zLL+tkP9EgelJJVRSz4w8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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