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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '556a86c979fe6ab646484295b67bc35411ea63a31bf80b0379895e41f5e1c7fc' 
  AND token = '8D/MTHj+Sj6FZYfWcxbGLaavV5ptC1HjyxGOegC1M+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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