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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43112ac83f0915b6d89421103df1d1453199fa4f58d035d726c5f42b87013d06' 
  AND token = 'CRlawg98jLTjT1HSveyu0okS0quZ9N19qGg0aC5DWDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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