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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c4ec087b80ed6212f51dd1f404fd23e0f578c1ad30eca30fb61fa52635a4362' 
  AND token = 'mnw3MyUQNw/plCXkNbVrYkl7i5zOySBg/4g7++F/OXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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