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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '909d884607872ae4db1534d0173a9edfea33c50b8d317f520b3afde74c1f68c1' 
  AND token = 'i6DcaFk2S6Y+ZlbqxXk3Xred07dYD+5AzZoyNuV0jVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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