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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a3f879bba32f991a386395f0de245911e5de01a68e461f4a42bd852ba01fd4e' 
  AND token = '3q/IBbsJpsA2B8zrFKp8W8Qi1SpXIfNfohe9voSwa7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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