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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39cd56d6407f3aa90f9536972e797e4d7d91fc1f3547981fae3e42e1d32ba20e' 
  AND token = '36o0DydXLOva9uwCVW8cZYwVXMxf90Pu2feKDzs+Cgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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