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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d934abf075f6412d8816f21955ff8ba02edc14a5f2e341704e5a5f69aa1e2f4' 
  AND token = 'z90ksJYx+uXuJN6z710cOSKuQuYLVzzC9SYmX0MnQSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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