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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c1e7d7414d3d23d7be0a849a369de7a1063009fde0b236870b41e0a1f38fe75' 
  AND token = 'WZPkwzmVugkRZAErPgWfvNbwUnMAuwOVN0FIalY0nSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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