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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cffba83e1ff3c2a5dafd0d4c9ee12f00c0972b17971c68f625032c9b01a5a5b' 
  AND token = 'foFrlPaYXyQmC9nv9KC+ByknO3BWUrbBLwE6dwC4F4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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