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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '156c066a22af3f0767707b181a5fdd8b7ed22116bd45c6c36fcd43afa1157d11' 
  AND token = 'QCc2+u2Vn5AHvOld5SBK6OtOSlN5YlOBRez6OXg/G6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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