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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43551736122bcce885959a66a6d0d8330e683c1b80b95d623dd2d7025c55c99c' 
  AND token = 'wrQXr1MBLD2LbSqS10peyiFHSgefxG7PwG9zYNykUYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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