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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5da5842284f4fbae429bf86bb09036f93783cafac2ccc4098227f4ab8265323' 
  AND token = '/cC1lWnasPpIwKfYTQO22jwYG2obtpdTHGmVjr+a5Ts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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