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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85cb5384ed92d9c372a8c79905f54e879eb88419d72874850b8fc166282dcd8b' 
  AND token = '4umINcb4UM3r+P7eXbdAJbjcKfR5U8YHMhbJ7qGrKgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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