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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e8c15ead5737fce7592ed07e3ee3e352f94836c2e11db9a9e834d888841f038' 
  AND token = 'akQCdu0JH6y34PBUlFAdyBGVc799C0q6NyX+URkmWxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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