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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cd1eb2b7e811470f44106e60337d5b8329bb180384e4d4b755aad84584243db' 
  AND token = 'vu+RRSHze/mZJTRY6QkAzFF1rxxi0gy6oZAPgJ+Mx44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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