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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc646153d1d9baa983f1d66e93c7388845958bc623a29c27750301766fc421fa' 
  AND token = 'r7x3CrEA/b9XPLTSWl0pjkK8onazuzJCJJctEfJTleI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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