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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd715cdbe10d2659ca87e5a37a119751edd5f5c7dcd0f183630dbb041f7ddae3' 
  AND token = 'haddnbwgE7pmKq/578KDM1JHx3pV2212/BTPRBCR7wQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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