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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36e0dfb868b5deab974a7f0d883a92780396fb4e9ee823be8bc85fec364f228c' 
  AND token = 'FChGE2va2Rtnq0LI61sdHnWAl5T5LEu4e00/UKgblas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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