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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d64a52c5678fc67016fe716b40a29b23a8dad8535a963a05c76d99a59ad29e3' 
  AND token = '1WOKKj+jZKgQdibgu9xeSDH0+ZV6HNVdL6m7yYzBoPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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