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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9f4599da82811f77a95e32215e4bb38350fce1b16db441b4437a9b5142e7c20' 
  AND token = '3pgwxr06tD4Ay3KS3/nf4DlGj1s5u9n76wWtlLzrZBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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