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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8e814e91a23c2607b3fc259799200656b986abc75ca13f012e2c4f44a3ccb77' 
  AND token = 'a6CiVHBBf+5NIO6orbQpodbSzMpR0LxQNNe5U3cG9vk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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