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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b3df4dbcb62ff417bb36e9201483de3d9585cc678303857868e6222c1f62edf' 
  AND token = 'a0zrPbVV+VT3rIoEX0fE2Gll0J4cXWREjl7U/g/ltIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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