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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1911787b994d92712bd63743c41e2116c97e60ce0d4657c74e5f4597ac188c23' 
  AND token = '30Fh/gjqDJpgY3gqzULoJi0E4A8GwroWNx1Bj9cUnoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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