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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5732fe84c7e1f82e336697398941369303e8d94d508dc8cf8e7cf7958d14b3ae' 
  AND token = 'MAbk5576Hx+7YZPPP6My3cV0o/exoYzSarltS9CJHgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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