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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d40ea509d12d66f52a4dfa95d628890969d9dcbad376b5556615540efb7f05e' 
  AND token = 'YrGai/jPzMCN6nrIXXLgFY7UEW6Z3oZMFqbbqkwkLp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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