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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1942f1c8dfc0cdd219c9ed8a611e90dfc3bdc0f7f0ae022cd747e7d4caf62f02' 
  AND token = 'KHLG94TbN04r826VV18kQiNmL5C56LNmZR2CxWRnLBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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