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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9955412675a4719f47e3b8e38f730169107e9ad3505c5803669b0024961a31b3' 
  AND token = 'tq9/7Qm7RzabYEwZblti42Z5HQEq77Yx/tcQ+nkG+IY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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