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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d77ec0c2054fb0a3403e362e53674407ad49e69948dddf579b677580cf577d8' 
  AND token = 'Gw9QTwFffRZPImDlDNClJyJkWq6IiyIzr0hXqXyAlLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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