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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8d06493ab5c22137a810755371b989e5bf6d486baeadd573fce60b162275613' 
  AND token = 'o5gTluI/n6mDGWnYie5Fg6epbgubXqTL7svd73u5vjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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