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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cd0750a9a20fdf482bdb391e8da930d3bd42e05a56231f3f94e953f194b0d14' 
  AND token = '6QQhb/oVzF9Z1SyGl48lT2mrvgjtd1o6oq1auqCllnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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