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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7198837b2cf5911261bca1fb4d9967256c51ce5b2de207e4cf449a4106e0863e' 
  AND token = 'a7OB+hco4auhCdvhccx3yPgjhxOPrmbny7nK4PbHmv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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