SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbb3caba2830af5d1454e5c168f17acb8f9d20f6d0e7a319f6874985ebc1eea8' 
  AND token = '5mBF9wWTKb4DejMvtwwdTfzUEzk9Cm7zgAgjq5SYiZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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