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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44812e373af86cb8c29d704b5d45c545fd8e5223ce16bf3d0c4df4cf3c4d810d' 
  AND token = 'ryKvuFhUoe1S5AmWUugK6Onsfx5oi3hFjhCBoQ9QG1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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