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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd28ae1ced5aee2e940e0e78b274301ad9e2dd2fdaec3357d90ff942ae01d6882' 
  AND token = 'I0hS6vq+Hxz1jn5q0qimguT5R/4Ics0XKav0PX7verM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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