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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abe874e29708132b7b233e9180ab97bf5a9085ec1377736fafa72abc323402d4' 
  AND token = '2Hd8mfyvgsj4bqiaUc/FqwDL8GhQHtQj0688/MuCVn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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