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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83d0b77260d7d76935aafea44c1b9882b4634f347d21c1a1a28717677e700636' 
  AND token = 'nQBwWgOnD96wyWW9vnYSkK8wj5cw+5//IXxnqo4A7tw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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