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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a990b1f7a4fa0e7edae78cecc0921f43362561bcc7ba58ece5449c7ecb14392c' 
  AND token = 'SBLzUkYV8536sJBDqJfACa4gcm1zCFWxpsyEa4KtX/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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