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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52f3871b79973c8d59266df8b613f66e37ced7aee00a85ddb8379fa62e9a8fa0' 
  AND token = 'mtqtKR/H/zMa7AlpChkxGoiS2cpWCb3UNGT9LtZCwj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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