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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd16a1306d007678c643d3bcd0a342143f2c909a10e8ba808aa9c352261f5689a' 
  AND token = 'BPTnr+8TcHH4p1ErGO87sBETt8mKNEe7bRiXvHgBGvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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