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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '062cd3ebfbd86c8d3309baa267b0615489dfacf7d402f24c9572deba4edfac1f' 
  AND token = 'IoOJYE90f6zSU0eW77LFF9Y7x4iS18UJFZuWhJ22SUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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