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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82244c9be179ff1e3b7884a0e088c05c94f222ea23045aeb82dafc921d406d57' 
  AND token = '0Co59WdYg1KBLovxu0lBkyGEG4/2rM9RAYnyA5J243Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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