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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d33d59ec6a95a3a6677e010114a497f3bfd7786346f818209cef12ba61789fd' 
  AND token = 'GCf3kqsaK0m/GxekBppG/CYrNaUYuYVtaKfqAhNXaHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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