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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19fc1da75a25717588a68bef75018d626212c8d1f9003b3b3fb602041b573571' 
  AND token = 'QwL9hZFrMqoknOmYjbIAWQjPrUo59PoM8PegHt+Xzro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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