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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68dea08b9722a4053341a8cc167bc55f20064fd926a1cd5a99118f7b6fb5bdc1' 
  AND token = 'KD3UEq7p9om+c+k1iwu8g6MgbP4X1Zqsudkilyhh6lc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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