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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95a451c7ff9d6adfa4db61f5eb587ba143ced0b057102da5b4161ea5aa7b4d70' 
  AND token = 'AfU0C1SX11jP8ofSiAw+zm2UrNqN3LtEgd4zAmqdn90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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