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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2b4d3da5fb9ef38f32cd1864e9e14e556b8915238e95a70d89468c2b16bc8e6' 
  AND token = '9TAIqsboy8iV97p68IjNuQv+ANXLBRK1o0ZjdXKxlWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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