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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1671d4f7ba865106a796ade249b02fafe655c0ff2086ea8e5b8d0972658521f4' 
  AND token = 'OQMVqwjfUxHs7y2XZivUjikbg4HMIf3FdX1jU6MeI7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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