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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4ac3b33c36b1484348eea3b60f938555898a058a985756c384941a8d5a86932' 
  AND token = '0+w56MYLOfipIlHVwrnrhsvVblWAyljs2yGVcUlrd7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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