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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '929554fab36b1e694767402820c1a4ee702cd361ea5597b36ded1f2d12a6ae50' 
  AND token = 'oryJ1G3SUQwpmGjXNWTvOc+SZNQ7VI9ms6D7LhXjacI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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