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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7de6756946f62688132f75dc4a6892f1061036e80f1822f13bd1a71f66754354' 
  AND token = 'wSYsGytMGLhHIQk7Rj58esIusgD4Yx7FNFFOU2AjMdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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