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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7026cc7fbed276fe30d447ff3c69653ac00b13b91dab6ae4a5f1f0c32df5dec' 
  AND token = 'avWtvC+SaQ+W9+oKKb9WzfnAloCaPSU16niaezaAWqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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